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Am J Vet Res. 1989 Sep;50(9):1544-7.

Enhanced platelet reactivity in heartworm-infected dogs.

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  • 1Department of Pathobiology, College of Veterinary Medicine, Auburn University, AL 36849-5519.


Platelet number, mean platelet volume, and platelet function were evaluated in 34 clinically normal dogs and 28 heartworm-infected (HWI) dogs. Mean platelet numbers for dogs of the HWI group was not significantly lower than those for dogs of the control group (214,000 vs 254,000 cells/microliter); however, 6 (21%) HWI dogs had platelet numbers less than 150,000/microliter, compared with only 2 (6%) heartworm-negative dogs. The mean platelet volume was not significantly different (7.8 vs 7.7 fl) between the 2 groups of dogs. Mean platelet aggregation responses to intermediate and low concentrations of collagen (3.0 and 1.5 micrograms) and to high, intermediate, and low concentrations of ADP (25, 10, and 5 microM) were greater in dogs of the HWI group. Mean platelet 14C-serotonin release was also greater in HWI dogs in response to high concentration of ADP (25 microM) and to intermediate concentration of collagen (3.0 micrograms).

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